Seiko Cal. 3894 - 550

Seiko 3894-550

The 3894-550 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 3894 caliber with 20j jewels beating at 28,800 bph, it delivers a 41 hours power reserve. [seikata-wm-fe916bfea1cd]

Also known as: Tuna, Bullhead

Specifications

Movement
Spring Drive
Case Material
PVD Black
Case Width
34mm
Case Thickness
11.3mm
Lug Width
20mm
Crystal
Acrylic
Bezel
Rotating
Water Resistance
140m
Dial Color
Silver
Jewels
20j
Frequency
28,800 bph
Power Reserve
41 hours
Year
1986

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